Note one non-obvious feature: you can ask for "http://sputnik.freewisdom.org/en/Ticket:000027.raw", then run it as Lua in a sandbox, take the environment with getfenv, then access the fields you want:
At the moment you can't get the list of tickets remotely (except by filtering http://sputnik.freewisdom.org/en/_sitemap.xml), but I am planning to extend Tickets to make it possible to get a list of tickets either as a plain text or as a lua table. (This shouldn't take more than a dozen lines of code.)